linux-kernel - [PATCH 04/11] perf/x86/intel/uncore: Disable I/O stacks to PMU mapping on ICX-D

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Date:   Thu, 17 Nov 2022 12:28:26 +0000
From:   alexander.antonov@...ux.intel.com
To:     peterz@...radead.org, linux-kernel@...r.kernel.org
Cc:     kan.liang@...ux.intel.com, alexey.v.bayduraev@...ux.intel.com,
        alexander.antonov@...ux.intel.com
Subject: [PATCH 04/11] perf/x86/intel/uncore: Disable I/O stacks to PMU mapping on ICX-D

From: Alexander Antonov <alexander.antonov@...ux.intel.com>

Current implementation of I/O stacks to PMU mapping doesn't support ICX-D.
Detect ICX-D system to disable mapping.

Fixes: 10337e95e04c ("perf/x86/intel/uncore: Enable I/O stacks to IIO PMON mapping on ICX")
Signed-off-by: Alexander Antonov <alexander.antonov@...ux.intel.com>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
Cc: stable@...r.kernel.org
---
 arch/x86/events/intel/uncore.h       | 1 +
 arch/x86/events/intel/uncore_snbep.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index ef1414957623..fac3612289f1 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -2,6 +2,7 @@
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <asm/apicdef.h>
+#include <asm/intel-family.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 
 #include <linux/perf_event.h>
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 0d06b56b8a33..e14b96398377 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -5226,6 +5226,11 @@ static int icx_iio_get_topology(struct intel_uncore_type *type)
 
 static int icx_iio_set_mapping(struct intel_uncore_type *type)
 {
+	/* Detect ICX-D system. This case is not supported */
+	if (boot_cpu_data.x86_model == INTEL_FAM6_ICELAKE_D) {
+		pmu_clear_mapping_attr(type->attr_update, &icx_iio_mapping_group);
+		return -EPERM;
+	}
 	return pmu_iio_set_mapping(type, &icx_iio_mapping_group);
 }
 
-- 
2.25.1